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    <title>Document</title>
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    <img src="qq作业素材/bg_chs.png">
    <h3>注册账号</h3>
    <h4>昵称<input type="text" pattern="^[-\w\u4E00-\u9FA5]{4,10}$">长度为4-10个字符</h4>
    <h4>密码<input type="password" pattern="^[\dA-Za-z]{6,16}$">长度为6-16个字符</h4>
    <h4>确认密码<input type="password" pattern="^[\dA-Za-z]{6,16}$">长度为6-16个字符</h4>
    <h4>手机号码<input type="tel" pattern="^1[3578]\d{9}$">密码长度为11位，以13|5|7|8开头</h4>
    <h4>邮箱<input type="email"></h4>
    <h4>年龄<input type="number" max="100" min="0" step="1" value="" pattern="^\d|[1-9]\d|1[0-2]\d$"></h4>
    <input type="image" src="qq作业素材/btn.jpg">
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